decent tool box that will allow me to fix a lot
Or, a just OK tool box that allows you to fix what's likely to fail. There is no end to the tools and spares you could use, eventually, but there's a point of diminishing return. At Quartzsite I saw a bus conversion that had several bays with snap on tool chests in each, I think the only thing he was missing was a milling machine. Maybe it was inside... You can carry enough spares to rebuild an engine or transmission but odds are pretty good even if you did, you're not doing that on the side of the road. So what are failures you can practically deal with, and what parts are needed for those? Maybe a tire plug kit, some spare wire and fuses for odd electrical issues, and basic tools to work on user serviced chassis and house items. I carry three small toolboxes. A basic mechanic tool set, a collection of spare parts like plumbing fittings, serpentine belt, glue, sealant, hardware assortment and sundry fix-its, and a toolbox of electrical/electronic stuff like fuses, relays, lamps, meters, tape, splices, wire. To date I've been able to address every failure on the road I've had, and a few failures of others I've been with. If I lose a crankshaft position sensor, my disc brakes catch fire, a clutch pack in my transmission gives up I'm done. But to carry all it takes to mitigate those failures isn't practical or realistic as it's hoped that preventive maintenance will reveal if these are potential problems. In my view, I don't need everything to fix every problem, just fix it well enough to get me somewhere I can.
Mark B.
Albuquerque, NM